linsci.c

BCM 控制demo源代码

#define LINSCI_C
/******************************************************************************
*                                                       
*       Copyright (C) 2005 Freescale Semiconductor, Inc.
*       All Rights Reserved								              
*														                            
* Filename:     linsci.c
*														                            
* Revision:      										                    
*														                            
* Functions:    SCI management module
*												                            
* Description:
*												                            
* Notes:        
*												                            
******************************************************************************/

#include <linbase.h>

#pragma MESSAGE DISABLE C4200 /* WARNING C4200: other segment than in previous declaration */

/****************************************************************************
 * All common-purpose RAM variables shall be declared here.
 * Some of the variables (more often used) can be located in the DIRECT page
 ***************************************************************************/
#if defined(USEZEROPAGE)
#pragma DATA_SEG __SHORT_SEG ZeroSeg
#endif /* defined(USEZEROPAGE) */

LIN_ZPAGE LIN_BYTE  LIN_TmpSCIStatus;   /* byte to clear SCI status, and to receive byte   */

#if defined(USEZEROPAGE)
#pragma DATA_SEG DEFAULT
#endif /* defined(USEZEROPAGE) */

/****************************************************************************
 * Functions 
 ***************************************************************************/
#pragma CODE_SEG .lintext

#if defined(LINAPI_1_0)

/***************************************************************************
 * Function :   l_ifc_init_sci0
 *
 * Description: Initialize SCI to work with LIN bus. 
 *                  Set specified baud rate;
 *                  Disable all SCI interrupts;
 *                  Enable Tx and RX pins
 *
 * Returns:     none
 *
 * Notes:       LIN API service
 *
 **************************************************************************/

void near l_ifc_init_sci0( void )
{
    LIN_BYTE    intMask;

    LIN_DBG_SET_PORT_7;
    intMask = LIN_DisableInt();     /* disable interrupts */

    /* Disconnect SCI and set initial state -- this is abort any activity */
    LIN_StateFlags = LIN_FLAG_IGNORE | LIN_FLAG_DISCONNECT;
    
    /* ??? SCI not disabled while initialization */
	LIN_SCISetBaudRate(LIN_CfgConst.LIN_BaudRate);	/* set SCI baud rate*/
	
	LIN_SCICR1 = 0;	/* one start bit, eight data bits, one stop bit */
	LIN_SCICR2 = LIN_SCICR2_TE | LIN_SCICR2_RE;  	/* enable transmitter & receiver and disable all SCI interrupts */
	
#if defined(SCI0)
/* Configure interrupt controller to give different priority */	
	LIN_INT_CFADDR = LIN_INT_CFADDR_IntChan_D;	/* Select page containing SCI0 channel vectors */
#if defined(USEXGATE)	
	LIN_INT_CFDATA3 = (LIN_CfgConst.LIN_SCIIntPriority | LIN_INT_CFADDR_UseXGate);	/* Configure SCI priority */
#else
	LIN_INT_CFDATA3 = LIN_CfgConst.LIN_SCIIntPriority;	/* Configure SCI priority */
#endif /* defined(USEXGATE) */

#elif defined(SCI1)
/* Configure interrupt controller to give different priority */	
	LIN_INT_CFADDR = LIN_INT_CFADDR_IntChan_D;	/* Select page containing SCI1 channel vectors */
#if defined(USEXGATE)	
	LIN_INT_CFDATA2 = (LIN_CfgConst.LIN_SCIIntPriority | LIN_INT_CFADDR_UseXGate);	/* Configure SCI priority */
#else
	LIN_INT_CFDATA2 = LIN_CfgConst.LIN_SCIIntPriority;	/* Configure SCI priority */
#endif /* defined(USEXGATE) */

#elif defined(SCI2)
/* Configure interrupt controller to give different priority */	
	LIN_INT_CFADDR = LIN_INT_CFADDR_IntChan_8;	/* Select page containing SCI2 channel vectors */
#if defined(USEXGATE)	
	LIN_INT_CFDATA5 = (LIN_CfgConst.LIN_SCIIntPriority | LIN_INT_CFADDR_UseXGate);	/* Configure SCI priority */
#else
	LIN_INT_CFDATA5 = LIN_CfgConst.LIN_SCIIntPriority;	/* Configure SCI priority */
#endif /* defined(USEXGATE) */

#elif defined(SCI3)
/* Configure interrupt controller to give different priority */	
	LIN_INT_CFADDR = LIN_INT_CFADDR_IntChan_8;	/* Select page containing SCI3 channel vectors */
#if defined(USEXGATE)	
	LIN_INT_CFDATA4 = (LIN_CfgConst.LIN_SCIIntPriority | LIN_INT_CFADDR_UseXGate);	/* Configure SCI priority */
#else
	LIN_INT_CFDATA4 = LIN_CfgConst.LIN_SCIIntPriority;	/* Configure SCI priority */
#endif /* defined(USEXGATE) */

#elif defined(SCI4)
/* Configure interrupt controller to give different priority */	
	LIN_INT_CFADDR = LIN_INT_CFADDR_IntChan_8;	/* Select page containing SCI4 channel vectors */
#if defined(USEXGATE)	
	LIN_INT_CFDATA3 = (LIN_CfgConst.LIN_SCIIntPriority | LIN_INT_CFADDR_UseXGate);	/* Configure SCI priority */
#else
	LIN_INT_CFDATA3 = LIN_CfgConst.LIN_SCIIntPriority;	/* Configure SCI priority */
#endif /* defined(USEXGATE) */

#elif defined(SCI5)
/* Configure interrupt controller to give different priority */	
	LIN_INT_CFADDR = LIN_INT_CFADDR_IntChan_8;	/* Select page containing SCI5 channel vectors */
#if defined(USEXGATE)	
	LIN_INT_CFDATA2 = (LIN_CfgConst.LIN_SCIIntPriority | LIN_INT_CFADDR_UseXGate);	/* Configure SCI priority */
#else
	LIN_INT_CFDATA2 = LIN_CfgConst.LIN_SCIIntPriority;	/* Configure SCI priority */
#endif /* defined(USEXGATE) */
#endif /* defined(SCI0) */

    LIN_EnableInt(intMask);         /* enable interrupts */
    LIN_DBG_CLR_PORT_7;
}


/***************************************************************************
 * Function :   l_ifc_connect_sci0
 *
 * Description: Connect SCI -- clear all SCI flags,
 *              enable SCI interrupts, reset idle timeout.
 *
 * Returns:     0   -- success
 *              ~0  -- called before l_ifc_init()
 *
 * Notes:       LIN API.
 *              If already connected then do nothing.
 *
 **************************************************************************/
l_bool near l_ifc_connect_sci0( void )
{
    l_irqmask   intMask;
    l_bool      ret;

    ret = 0;    /* suppose that connecting OK */

    LIN_DBG_SET_PORT_7;
    intMask = LIN_DisableInt();     /* disable interrupts */

    /* if l_ifc_connect called before l_ifc_init then return error */
    if ( (LIN_StateFlags & LIN_FLAG_NOINIT) != 0 )
    {
        ret = ~0;
    }

    /* we are after l_ifc_init */

    /* if an interrupt occurs here and call l_sys_init() then we in LIN_FLAG_NOINIT
       so we need interrupt disabling -- OPTIM */

    /* if interface is already connected then do nothing */
    else if ( (LIN_StateFlags & LIN_FLAG_DISCONNECT) != 0 )
    {
        /* we are in disconnected state -> connect */

        /* connect SCI hardware */

		LIN_TmpSCIStatus = LIN_SCISR1;	/* clear SCI status */
		LIN_TmpSCIByte = LIN_SCIDRL;	
	
		LIN_SCICR2 |= LIN_SCICR2_RIE;    	/* enable RX complited interrupt */

        /* start to wait break */
        LIN_StateFlags = LIN_FLAG_IGNORE;

        /* reset idle timeout */
        LIN_SetIdleTimeout();               
    }

    LIN_EnableInt(intMask);         /* enable interrupts */
    LIN_DBG_CLR_PORT_7;

    return ret;
}

/***************************************************************************
 * Function :   l_ifc_disconnect_sci0
 *
 * Description: Disconnect SCI -- disable SCI interrupts.
 *
 * Returns:     0   -- success
 *              ~0  -- called before l_ifc_init()
 *
 * Notes:       LIN API.
 *              If already disconnected then do nothing.
 *
 **************************************************************************/
l_bool near l_ifc_disconnect_sci0( void )
{
    l_irqmask   intMask;
    l_bool      ret;

    ret = 0;    /* suppose that disconnecting OK */

    LIN_DBG_SET_PORT_7;
    intMask = LIN_DisableInt();     /* disable interrupts */

    /* if l_ifc_disconnect called before l_ifc_init then return error */
    if ( (LIN_StateFlags & LIN_FLAG_NOINIT) != 0 )
    {
        ret = ~0;
    }

    /* we are after l_ifc_init */

    /* if an interrupt occurs here and call l_sys_init() then we in LIN_FLAG_NOINIT
       so we need interrupt disabling -- OPTIM */

    /* if interface is already disconnected then do nothing */
    else if ( (LIN_StateFlags & LIN_FLAG_DISCONNECT) == 0 )
    {
        /* we are in connected state -> disconnect */

        /* disconnect SCI hardware */

		LIN_SCICR2 = LIN_SCICR2_TE | LIN_SCICR2_RE;  	/* enable transmitter & receiver and disable all SCI interrupts */

        /* set disconnected state */
        LIN_StateFlags = LIN_FLAG_IGNORE | LIN_FLAG_DISCONNECT;
    }

    LIN_EnableInt(intMask);         /* enable interrupts */
    LIN_DBG_CLR_PORT_7;

    return ret;
}


#else /* !defined(LINAPI_1_0) */


/***************************************************************************
 * Function :   LIN_SCIInit
 *
 * Description: Initialize SCI to work with LIN bus. 
 *                  Set specified baud rate;
 *                  Disable all SCI interrupts;
 *                  Enable Tx and RX pins
 *                  Enable Rx interrupt
 *
 * Returns:     none
 *
 * Notes:       1. SLAVE, MASTER node
 *              2. Required for cosmic linker. If no functions are used 
 *                 from particular .obj file this file is not linked!
 *                 We can make it as macros ? -- OPTIM 
 *
 **************************************************************************/
void near LIN_SCIInit( void )
{
    /* ??? SCI not disabled while initialization */
	LIN_SCISetBaudRate(LIN_CfgConst.LIN_BaudRate);	/* set SCI baud rate*/

	LIN_SCICR1 = 0;	/* one start bit, eight data bits, one stop bit */